(3S,6S,9S,12R,13R,14R,15R)-12-Ethyl-13-hydroxy-6-((R)-1-hydroxy-ethyl)-3-hydroxymethyl-9-isopropyl-14-methyl-15-tridecyl-1-oxa-4,7,10-triaza-cyclopentadecane-2,5,8,11-tetraone   、                                                                                      
乙酸酐                                                                                                                                                              在
                                                                                                                                                                                 
吡啶                                                                                                                                  作用下,
                                                                                                                                                                                        反应 2.0h,
                                                                                                                以7 mg的产率得到Acetic acid (3S,6S,9S,12R,13R,14R,15R)-12-ethyl-13-hydroxy-6-((R)-1-hydroxy-ethyl)-9-isopropyl-14-methyl-2,5,8,11-tetraoxo-15-tridecyl-1-oxa-4,7,10-triaza-cyclopentadec-3-ylmethyl ester